1/* 2 * DES encryption/decryption 3 * Copyright (c) 2007 Reimar Doeffinger 4 * 5 * This file is part of Libav. 6 * 7 * Libav is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * Libav is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with Libav; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#ifndef AVUTIL_DES_H 23#define AVUTIL_DES_H 24 25#include <stdint.h> 26 27struct AVDES { 28 uint64_t round_keys[3][16]; 29 int triple_des; 30}; 31 32/** 33 * @brief Initializes an AVDES context. 34 * 35 * @param key_bits must be 64 or 192 36 * @param decrypt 0 for encryption/CBC-MAC, 1 for decryption 37 */ 38int av_des_init(struct AVDES *d, const uint8_t *key, int key_bits, int decrypt); 39 40/** 41 * @brief Encrypts / decrypts using the DES algorithm. 42 * 43 * @param count number of 8 byte blocks 44 * @param dst destination array, can be equal to src, must be 8-byte aligned 45 * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL 46 * @param iv initialization vector for CBC mode, if NULL then ECB will be used, 47 * must be 8-byte aligned 48 * @param decrypt 0 for encryption, 1 for decryption 49 */ 50void av_des_crypt(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt); 51 52/** 53 * @brief Calculates CBC-MAC using the DES algorithm. 54 * 55 * @param count number of 8 byte blocks 56 * @param dst destination array, can be equal to src, must be 8-byte aligned 57 * @param src source array, can be equal to dst, must be 8-byte aligned, may be NULL 58 */ 59void av_des_mac(struct AVDES *d, uint8_t *dst, const uint8_t *src, int count); 60 61#endif /* AVUTIL_DES_H */ 62